Chemical transformations of a SiO2-supported - cluster and calalysis of propylene hydroformylation

Article abstract of DOI:10.1007/BF00698489

Chemical transformations of SiO2-supported ^- and ^- clusters in Ar, CO, and synthetic gas are studied by IR spectroscopy, Moussbauer spectroscopy, and transmission electron microscopy.It is shown that partial transformation of the ^- cluster to the ^- cluster occurs immediately after its deposition on the substrate surface with the simultaneous formation of Fe²⁺ ions.The complete conversion of the supported ^- cluster to ^- is observed at 323 K in the synthesis gas.At 373 to 423 K ^- transforms into a mixture of Fe4Rh2C(CO)16, ^-, and ^- clusters.In the 523 to 623 K range, the supported ^- cluster decarbonylates completely to form bimetallic species < 5 Angstroem in size.Silica-supported FeRh clusters are active propylene hydroformylation at 423 to 473 K and form a mixture of butyl alcohols and butyraldehydes. - Key words: carbonyl clusters, silica gel, propylene, hydroformylation; IR spectroscopy; Moessbauer spectroscopy.